One hundred years into the future, when our great-grandkids look back to what was capturing the world’s imagination on YouTube in 2011, what will they make of us? Will they still be delighted by babbling babies? Will they still be “so excited” about the weekend? And will they be any closer to understanding the mystery of the space-traveling toaster pastry cat?

Check out YouTube.com/Rewind for a timeline of this year's most popular videos and events and to see what the world watched in 2011.

Today, we rewind through the videos and channels that absorbed our collective global attention this year. To compile these lists, we looked at global view counts of popular videos uploaded throughout this year, and, in some instances, we aggregated views across multiple versions of the same video. 2011 was a year of amazing new channels and new stars being discovered, awesome creativity, and of course, Rebecca Black. It was also a year of powerful news stories playing out on YouTube, as people witnessed and documented uprisings and natural disasters, touching personal moments and moments of protest.

In total, there were more than 1,000,000,000,000 (one trillion) playbacks on YouTube this year (yep, count ‘em, 12 zeroes). That’s about 140 views for every person on the earth. More than twice as many stars as in the Milky Way. And if I had a penny for every … OK, you get my drift, it’s a big number.